Spear of assembled flares (1) for the partial widening of a hollow profile of tubular shape - which extends in a straight line - by exerting high internal pressure on the hollow profile by means of a fluid; equipped with a joint support (2), which is rod-shaped and detachably fixed in a support catch; with a gasket device (7), which is arranged in the gasket support (2) and which is composed of at least two sealing rings (8) - which by means of an intermediate bushing (10) are spaced apart from each other and those , with respect to the inner diameter of the hollow profile, they are made with a certain oversize in their outer diameter - as it is also composed of at least one spacer sleeve (9), which is arranged between the pair of sealing rings and the holding of the support; gasket device which has an axial inlet bore (3) - which is connected to a source of high pressure fluid - as well as has at least one transverse bore (4), which branches from the inlet bore (3) and which flows between the pair of sealing rings as well as equipped with an axial end support of the joint device (7), which is far from the support; lance of flares this one that is characterized in that each of the sealing rings (8) is composed of two component parts; in this case, the first component part is constituted by an elastomer ring (19), which is poor in abrasion and is resistant to high pressure and which, elastically deformable by high internal pressure in the axial direction, is it is placed butt on the lateral surface (5) of the joint support (2); while the second component part is constituted by a support ring (28), which is resistant to high pressure and is elastic in the radial direction, it also has a very high tensile strength in the axial direction; as well as characterized in that this elastomer ring (19) has - on that side (14) of its own, which is far from the nearest transverse bore (4) - a circumferential shoulder (27), in which the ring of support (28) and the one surrounded by the support ring (28); by the joint support (2); as well as by an axial stop, which is arranged in the latter.
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